Foam formation in gas-assisted injection molded parts: Theoretical and experimental considerations

This article is concerned with a physico-mathematical model to describe the foaming phenomenon in gas-assisted injection molded parts. The investigations have been conducted on polycarbonate grades to begin with. When parts are produced by gas injection molding, foam has the effect of weakening the residual wall thickness and also of impairing optical quality. It would thus be an advantage if a parameter constellation could be defined in advance, which would ensure the suppression of foam formation.